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Loans, net and allowance for loan losses - Summary of Changes in Accretible Yield and Nonaccretible Difference of Acquired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Beginning Balance, Accretible	$ 60	$ 895
Additions, Accretible			$ 934
Accretion, Accretible	(60)	(280)	(39)
Charge-offs, Accretible		(398)
Payments, Accretible		(157)
Ending Balance, Accretible		60	895
Beginning Balance, Nonaccretible	2,588	6,892
Additions, Nonaccretible			6,892
Charge-offs, Nonaccretible		(2,703)
Payments, Nonaccretible	(360)	(1,601)
Ending Balance, Nonaccretible	$ 2,228	$ 2,588	$ 6,892

X

- Definition

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield Charge Off

+ References

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- Definition

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- Definition

Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

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Amount of additions to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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